Lihue, Kauai weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Excellent
Best time to visit: January – December
What is the weather like in Lihue, Kauai in September?
In September, Lihue, Kauai is hot: daytime highs average 28 °C, and even at night it stays warm at around 24 °C. The sea averages 27.0 °C – lovely and warm for swimming. The sun shines for around 8 hours a day. It is the rainy season: rain falls on about 14 days, totalling 39 mm. The air is often humid and muggy. All in all, September is an excellent month for a holiday in Lihue, Kauai.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 85 | 83 | 78 |
| Day | 28° | 28° | 27° |
| Night | 24° | 24° | 24° |
| Sea | 27° | 27° | 27° |
| Sun | 9 h | 8 h | 7 h |
| Rain days | 14 | 14 | 15 |
More details for September
- Daylight
- 12 h 18 min06:24 – 18:42
- UV index
- 11 · extremeclear sky, noon (estimate)All months
- Muggy days
- 30 daysdew point 18 °C or moreAll months
- Wind
- 15 km/haverage daily peakAll months
- Cloud cover
- 45 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Time zone
- UTC−10Pacific/Honolulu
How the score comes together
- Temperatureweight 35 %100 %
- Seaweight 25 %100 %
- Sunshineweight 20 %87 %
- Few rainy daysweight 20 %28 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in September
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Insect repellent
- Rain jacket or umbrella
Lihue, Kauai in September: quick answers
Is Lihue, Kauai hot in September?
Yes. In September, Lihue, Kauai is hot: daytime highs average 28 °C and nights stay around 24 °C.
Can you swim in Lihue, Kauai in September?
Yes. In September the sea averages 27.0 °C – lovely and warm for swimming.
Does it rain much in Lihue, Kauai in September?
It rains often – on about 14 days, adding up to 39 mm.
Lihue, Kauai month by month
The whole year in Lihue, KauaiAll destinations: USAHawaii weather in SeptemberWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences